Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2522ceb443bb3f…

MALICIOUS

PDF

73.1 KB Created: 2021-03-01 17:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a65ace9d3655dc2005f9ed97e3966a5e SHA-1: 1bdf39bf008aacf81ac0619b4e113e7ece356719 SHA-256: 1a2522ceb443bb3f8757c9eeed416b8dae0f6fb30e850115b6a73581f941c8c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure related to a 'digestive system review crossword puzzle answer key', which is likely a pretext to drive users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/wb?keyword=digestive%20system%20review%20crossword%20puzzle%20answer%20key PDF link annotation
    • http://beviluxenumiliv.mywebcommunity.org/all_modal_verbs_in_english_grammar.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/ximobisopixijikebivavog.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/norolelawazulufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_5fe997ab59eb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445869/normal_5ff708d524ce9.pdfIn PDF document text
    • http://zejenaxudemato.22web.org/photoshop_cs6_amtlib_dll_file.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/how_to_knit_slipper_socks_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_6021d5e4d83d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_600a4e2a7b331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453908/normal_5ffbccec6af3b.pdfIn PDF document text
    • http://numulul.mygamesonline.org/how_to_study_for_ap_human_geography_test.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/66296247338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodegodonirad.atwebpages.com/37863952647.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/58326158487.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/wintercroft_mask_download_free.pdfIn PDF document text
    • http://jufulejilola.epizy.com/37026154718.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/the_5_minute_journal_template.pdfIn PDF document text
    • http://fafivanewus.rf.gd/filefelosubavijaxofafo.pdfIn PDF document text
    • http://zijupowisupol.rf.gd/78474359092.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/71502626089.pdfIn PDF document text
    • http://fobumiwaw.epizy.com/72606136614.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 5760 bytes
SHA-256: 00a61385e2ced928f50fc07f2f66fef6e500e668b6468e2258eb6b5af8570dce
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 10412 bytes
SHA-256: 66e7908c756ac3969f75c96c8391ca1003787513cd7989995ddf6928fa45fc13

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